Defect-engineered tailoring of physical properties has recently achieved key consideration in Optoelectronics, sensors, and energy storage materials. The paper delineates how defects can be introduced by the adatom process in molybdenum oxide by thermal vapor deposition, which changes the physical appearance from white (MP) to black (MB). Both the samples are subjected to morphological, structural, optical, and thermal characterizations by X-ray Diffraction, Fourier Transform Infrared Spectroscopy, Raman Spectroscopy, X-ray Photoelectron Spectroscopy, Thermogravimetric Analysis, Scanning Electron Microscopy, and Ultraviolet–Visible spectroscopy. The analyses throw light into defect-induced structure modifications arising due to lattice dislocation, oxygen vacancies, and formation of suboxides. The thermal diffusivity variations are investigated using the laser-assisted non-destructive photopyroelectric back configuration method, which revealed MB’s thermal diffusivity as one-tenth of MP’s. The observed change in thermal diffusivity because of the structure defects, as revealed by other characterizations, affects the phonon scattering. Thus, the study suggests that defect engineering is a potential methodology for tailoring the thermal diffusivity of materials.

中文翻译：

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氧化钼的缺陷工程热扩散率改性：一项光热释电研究


最近，物理特性的缺陷工程定制已成为光电子、传感器和储能材料的关键考虑因素。该论文描述了氧化钼中的杂原子过程如何通过热气相沉积引入缺陷，从而将物理外观从白色 （MP） 变为黑色 （MB）。通过 X 射线衍射、傅里叶变换红外光谱、拉曼光谱、X 射线光电子能谱、热重分析、扫描电子显微镜和紫外-可见光谱对这两个样品进行形态、结构、光学和热表征。这些分析揭示了由于晶格位错、氧空位和亚氧化物的形成而引起的缺陷诱导的结构改变。使用激光辅助非破坏性光热释电背配置方法研究了热扩散率变化，结果显示 MB 的热扩散率为 MP 的十分之一。正如其他表征所揭示的那样，由于结构缺陷而观察到的热扩散率变化会影响声子散射。因此，该研究表明，缺陷工程是定制材料热扩散率的一种潜在方法。